Redmi smartphones, including the popular 9A, often have modest built-in storage. Users regularly face a shortage of space to install new games, messengers and navigators, leading to slowdowns, and the solution is to use an external microSD drive to host user data and programs.
But the Android operating system and the MIUI shell have their own file system features, and simply inserting a card is not enough to fully port programs, and you need to set up the device properly, format the media, and change the system settings so that applications can run from an external source without failure.
In this guide, we will discuss in detail all the steps of memory expansion. SD-cards as a system storage and get a step-by-step algorithm of actions for your gadget.
Features of memory architecture in MIUI
Xiaomi device owners should understand that the default system does not allow you to simply migrate the application. This is done by Google developers and shell manufacturers to ensure the stability and security of data. Internal memory is faster than most microSD cards, so critical system processes always remain on the embedded chip.
The technology that allows you to combine external and internal memory is called Adoptable Storage, which turns the card into a full partition of the disk. On Redmi 9A, this feature is often hidden or limited, but there are proven ways to activate it. Without special modes, you can only store photos, videos and documents.
It’s worth noting that once the map is formatted for the application, it will no longer be read on other devices without being re-cleaned, an important nuance that many users who want to simply copy files to their computer forget.
Why is Xiaomi hiding this feature?
Preparation of the memory card for work
The first step is to choose a quality media, and you need fast write speeds to install applications, so old Class 4 or Class 6 cards won't work, and the minimum standard is Class 10, and ideally, UHS-I or A1 labels.
Put the card into the slot of the device. The system will immediately suggest formatting it. If you plan to use it only as a photo storage, select "Use as a portable storage." To install games, we will need a more complex path through an engineering menu or a computer.
Make sure that the card is not important data, as during the setup process it will be completely cleared. Backing up files to your computer is a mandatory procedure before starting any manipulation of disk partitions.
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Use SD Insight or similar utilities from the Play Market to check the real speed and authenticity of your memory card before installing important applications.
Activation of the developer mode
To access hidden memory management functions, you need to unlock advanced settings. This is a standard procedure for all Android devices to make changes to the system. On Redmi 9A, this is done through the About Phone menu.
Find the MIUI version and quickly tap it seven times in a row. The screen blinks and a notification will appear that the developer mode is activated. Now a new section will appear in the advanced settings.
Go to the menu "Extended settings" and select "Developers". Scroll down to the list "Forced allow the removal of applications to the SD-Activate this switch. This action instructs the system to consider the external drive as a potential place to install programs.
☑️ Setting up the developer mode
Formatting via Computer (ADB)
The most reliable way to turn a card into internal memory is to use USB debugging and ADB. This method requires a PC connection, but guarantees the correct result without the risk of damaging the phone’s system files.
Turn on USB debugging in the developer menu. Connect your phone to your computer with a cable. On your smartphone screen, you'll see a request for debugging permission -- check "Always Allow" and click "OK."
Run the command line in the ADB folder and type in the command to check the connection: adb devices. If everything is connected correctly, you will see the serial number of the device. Next, you should enter the command to go to shell mode: adb shell.
Now you need to find your card ID. Type in the command: sm list-disks. The system will give you a response in disk:179.64 (the numbers may differ). Remember this number, it is critical for the next step.
| Team team. | Description of action | The result |
|---|---|---|
| adb shell | Launching the Android shell | The appearance of the $ symbol |
| sm list-disks | Search for connected disks | Displaying the card ID (disk:xxx,xx) |
| sm partition disk:xxx,xx private | Formatting in | The map will become an internal memory. |
| sm list-volumes | Status check for volumes | Private status |
For the final formatting, type the command: sm partition disk:179.64 private, replacing the digits with your ID. The process will take a few minutes. Once complete, the phone can restart, and the card will be defined as internal memory.
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Using ADB is the only guaranteed way to circumvent the limitations of MIUI and fully integrate memory without root rights.
Transfer of installed applications
Once formatted successfully, the system starts to see the map as part of the internal storage, but the applications that are already installed won't move automatically. You have to manually initiate this process for each application.
Go to Settings, select Apps, and find the program you want (like a hard game or a navigator). Click on Storage. If you did everything right, it will show a button called Change or Move to SD-map".
Press the button and wait until the process is over. The transfer time depends on the size of the application and the speed of your card. Some system applications, such as Google Play Services or the MIUI shell itself, will not be able to move, this is a limitation of Android security.
⚠️ Note: If you remove the memory card, all the ported applications will stop working and their data may be lost.
Setup of camera and downloads
To keep the internal memory from getting filled with garbage, it's important to set up automatic media storage. The camera in MIUI defaults to write the photo to the internal storage, which you need to change in the settings of the camera application itself.
Open the camera, press three bars in the corner of the screen and select "Settings." Find the switch "Save to" SD-Now all the new pictures and videos. 4K They will immediately be on the external storage.
You should also configure browsers and messengers. In Telegram, WhatsApp and Chrome, in the download settings, specify the path to the download. SD-This will prevent the main partition from being filled quickly with cache and files.
Possible problems and solutions
Users may encounter errors during operation. Often the system writes"SD-The card is corrupted or the applications crash when they start up, which may indicate a slow write speed or file system corruption.
If memory cards are unstable, try formatting them again by choosing the exFAT file system over FAT32 if the card is larger than 32 GB. It also helps to replace the card reader or USB cable when connecting to a PC.
In some cases, after updating MIUI, the memory settings may reset. You will have to re-activate the developer mode, but the data on the card (if it was formatted as portable) is likely to remain.
⚠️ Warning: Do not use memory cards purchased on dubious marketplaces at a low price. Counterfeiting has real capacity at times less than the declared, which leads to cyclical overwriting and loss of application data.